#radiowaves — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #radiowaves, aggregated by home.social.
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Idea:
A team that will find out why people have the feeling/idea that they are being radiated with radio frequencies -
Radio Waves: Origins of PRI’s The World, Hona Ghazza, and Vatican Radio at 95
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The one sign that someone is highly intelligent, according to genius inventor Nikola Tesla
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https://www.europesays.com/ie/157794/ Rising CO2 levels threaten to disrupt global space communication #CarbonDioxide #credit #Éire #GeophysicalResearchLetters #IE #Ionosphere #Ireland #KyushuUniversity #MetallicIons #MiddleColumn #OuterSpace #ProfessorHuixinLiu #RadioCommunication #RadioWaves #Science #SpaceDebris #TheAtmosphere
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Brightest fast radio burst ever detected could help solve an enduring cosmic mystery
Astronomers have spotted the brightest fast radio burst yet coming from a nearby galaxy. Observations of this phenomenon,…
#NewsBeep #News #Science #AmandaCook #burst #CA #Canada #Chime #Fastradiobursts #HarvardCollegeObservatory #Outriggers #PeterBlanchard #radiobursts #radiotelescope #radiowaves
https://www.newsbeep.com/ca/99642/ -
Brightest fast radio burst ever detected could help solve an enduring cosmic mystery
Astronomers have spotted the brightest fast radio burst yet coming from a nearby galaxy. Observations of this phenomenon,…
#NewsBeep #News #Science #AmandaCook #burst #CA #Canada #Chime #Fastradiobursts #HarvardCollegeObservatory #Outriggers #PeterBlanchard #radiobursts #radiotelescope #radiowaves
https://www.newsbeep.com/ca/99642/ -
The South African MeerKAT telescope is the precursor of SKA-MID. The expanded MeerKAT+ array — including more than a dozen additional SKA antennas and receivers — is part of a project funded in partnership by SARAO (@ska_africa), the Max Planck Society (@maxplanckgesellschaft), and INAF.
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Mühlheimer Nacht at the Kunstwerk Köln e.V.
Kunstwerk Köln e.V., Saturday, April 5 at 07:00 PM GMT+2
For only 10 bugs you get a delicate live selection of the cream of the European #netLabel and #creativeCommons scene here.
Including Prince Lucija, Der Analoge Mann, Rundfunkorchestra (featuring among others Konrad "Clongclongmoo" Behr and Noisio), Drehkommando, Mindström, Hanns von Guglet and others, even me (die nmi!), and possibly more surprise guests - most of them active here within the mighty #Fediverse ;).
More details?
https://www.muelheimernacht.de/ (scroll a bit down and click at Kunstwerk Köln e.V.)
Much thanks to @[email protected] for organizing this. Very much respect to you, pal!https://do.basspistol.org/event/muhlheimer-nacht-at-the-kunstwerk-koln-ev
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Basic Electronics for the Amateur Radio Operator: What You Need to Know for Your Technician License
1,003 words, 5 minutes read time.
If you’re preparing for the Amateur Radio Technician License Exam, understanding basic electronics is a must. While you don’t need to be an electrical engineer, the exam includes fundamental concepts like Ohm’s Law, circuits, components, and RF safety. This guide will walk you through the essential topics, ensuring you’re ready for the test and your first steps as a ham radio operator.
Understanding Electricity: The Basics for Amateur Radio
Electricity is the movement of electrons through a conductor, like a wire. Three key electrical properties define how electricity behaves:
- Voltage (V) is the force that pushes electrons through a circuit. It’s measured in volts (V).
- Current (I) is the flow of electrons, measured in amperes (A).
- Resistance (R) opposes the flow of electricity and is measured in ohms (Ω).
These three are tied together by Ohm’s Law, a fundamental equation in electronics:
V=I×R
This means if you know any two values, you can calculate the third. Understanding this equation is critical for both the exam and real-world troubleshooting.
Direct Current (DC) vs. Alternating Current (AC)
Electricity comes in two forms:
- Direct Current (DC) flows in one direction. Batteries and solar panels produce DC.
- Alternating Current (AC) changes direction many times per second. Household electricity is AC because it’s more efficient for transmission over long distances.
For amateur radio, most equipment runs on DC power, but you’ll also need to understand AC because radio signals are alternating currents that oscillate at high frequencies.
Essential Electronic Components and Their Functions
Several key electronic components appear on the Technician Exam. Here’s what they do:
- Resistors limit current flow.
- Capacitors store and release energy, often used in filtering circuits.
- Inductors store energy in magnetic fields and are important in tuning circuits.
- Diodes allow current to flow in only one direction, useful in rectifier circuits that convert AC to DC.
- Transistors act as switches and amplifiers in radio circuits.
Understanding these basics helps you answer questions about circuit behavior and troubleshooting.
Series and Parallel Circuits
Circuits are made up of components arranged in either series or parallel:
- In a series circuit, current flows through all components one after another. The same current passes through each, but the voltage is divided.
- In a parallel circuit, components share the same voltage, but the current divides among them.
For the exam, you should know how voltage, current, and resistance behave in each type of circuit. For example, total resistance in a series circuit is the sum of all resistances, while in parallel circuits, total resistance is lower than the smallest individual resistor.
Basic AC Concepts and Frequency
Radio waves are AC signals that oscillate at different frequencies. Frequency (f) is measured in hertz (Hz) and tells us how many times per second the wave changes direction. One kilohertz (kHz) is 1,000 Hz, and one megahertz (MHz) is 1,000,000 Hz.
Ham radios operate in different frequency bands, such as:
- VHF (Very High Frequency): 30 MHz – 300 MHz (e.g., 2-meter band)
- UHF (Ultra High Frequency): 300 MHz – 3 GHz (e.g., 70-centimeter band)
Higher frequencies allow for shorter antennas and are good for local communication, while lower frequencies travel further.
Modulation: How We Send Information Over Radio Waves
Modulation is how a radio wave (carrier wave) carries information. The Technician Exam covers three main types:
- Amplitude Modulation (AM): The signal strength (amplitude) changes with the voice signal.
- Frequency Modulation (FM): The frequency of the wave changes to encode information. FM is more resistant to noise and is commonly used in VHF and UHF bands.
- Single Sideband (SSB): A variation of AM that uses less bandwidth and is more efficient for long-distance communication.
Knowing these helps when selecting modes for different types of contacts.
Power, Batteries, and Safety
Most ham radios run on 12V DC power sources, such as batteries or regulated power supplies. It’s important to understand:
- Battery safety: Overcharging or short-circuiting batteries (especially lithium-ion) can be dangerous.
- Fuse protection: Many radios have built-in fuses to prevent excessive current draw.
Another key topic on the test is RF exposure safety. High-power transmissions can generate strong radio frequency (RF) radiation, which may cause health risks. To minimize exposure:
- Maintain a safe distance from transmitting antennas.
- Use the lowest power necessary for effective communication.
- Follow FCC RF exposure limits for your frequency and power level.
Ohm’s Law in Real-World Ham Radio Applications
A common exam question might involve calculating current or voltage using Ohm’s Law. For example:
Question: If a radio operates at 12V and draws 2A of current, what is the resistance?
Using Ohm’s Law:
Understanding these calculations can help with troubleshooting and designing circuits.
Final Thoughts: Studying for the Exam and Beyond
The Technician License Exam covers these topics, but learning electronics doesn’t stop there. Once licensed, you’ll continue exploring concepts like antenna design, signal propagation, and digital communication.
Great resources for studying include:
- ARRL’s Technician Class License Manual: The official guide with explanations and practice questions.
- HamStudy.org: Free practice tests and flashcards.
- QRZ.com Practice Exams: Simulated tests with real exam questions.
By mastering these basic electronics concepts, you’ll be well on your way to passing the exam and starting your journey in amateur radio. Keep practicing, get hands-on experience, and soon, you’ll be making contacts on the air!
D. Bryan King
Sources
- American Radio Relay League (ARRL) – Official Site
- FCC Amateur Radio Service – Licensing and Regulations
- QRZ.com – Amateur Radio Callsign Database
- HamStudy.org – Exam Prep and Study Tools
- Electronics Tutorials – Basic Circuit Theory
- RadioReference.com – Frequency Database and Scanner Information
- AMSAT – Amateur Radio Satellites and Space Communications
- DX Engineering – Ham Radio Equipment and Resources
- MikroE Learn – Electronics and Circuit Design Tutorials
- Radio Society of Great Britain (RSGB) – Ham Radio Resources
- Arduino – Microcontrollers and DIY Electronics for Ham Radio
- eHam.net – Amateur Radio News, Reviews, and Forums
Disclaimer:
The views and opinions expressed in this post are solely those of the author. The information provided is based on personal research, experience, and understanding of the subject matter at the time of writing. Readers should consult relevant experts or authorities for specific guidance related to their unique situations.
Related Posts
Rate this:
#ACVsDC #am #AmateurRadio #amateurRadioEducation #amateurRadioTraining #antennaTheory #ARRLStudyGuide #basicElectronics #beginnerHamRadio #capacitors #circuits #current #diodes #electricalComponents #electronicsBasics #examPrep #FCCExam #FM #hamExam #hamLicense #hamOperator #hamRadio #hamRadioBands #hamRadioBeginner #hamRadioComponents #hamRadioEquipment #hamRadioOperator #hamRadioStudy #HamRadioStudyGuide #HamRadioTraining #hamStudyGuide #inductors #modulation #OhmSLaw #powerSupply #radioBroadcasting #radioCommunication #radioFrequencies #radioFrequency #radioFundamentals #RadioLicensing #radioSignals #RadioTechnology #radioTransmission #radioWaves #resistance #resistors #RFExposure #RFSafety #SSB #technicianClass #TechnicianLicense #transistors #UHF #VHF #voltage
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Basic Electronics for the Amateur Radio Operator: What You Need to Know for Your Technician License
1,003 words, 5 minutes read time.
If you’re preparing for the Amateur Radio Technician License Exam, understanding basic electronics is a must. While you don’t need to be an electrical engineer, the exam includes fundamental concepts like Ohm’s Law, circuits, components, and RF safety. This guide will walk you through the essential topics, ensuring you’re ready for the test and your first steps as a ham radio operator.
Understanding Electricity: The Basics for Amateur Radio
Electricity is the movement of electrons through a conductor, like a wire. Three key electrical properties define how electricity behaves:
- Voltage (V) is the force that pushes electrons through a circuit. It’s measured in volts (V).
- Current (I) is the flow of electrons, measured in amperes (A).
- Resistance (R) opposes the flow of electricity and is measured in ohms (Ω).
These three are tied together by Ohm’s Law, a fundamental equation in electronics:
V=I×R
This means if you know any two values, you can calculate the third. Understanding this equation is critical for both the exam and real-world troubleshooting.
Direct Current (DC) vs. Alternating Current (AC)
Electricity comes in two forms:
- Direct Current (DC) flows in one direction. Batteries and solar panels produce DC.
- Alternating Current (AC) changes direction many times per second. Household electricity is AC because it’s more efficient for transmission over long distances.
For amateur radio, most equipment runs on DC power, but you’ll also need to understand AC because radio signals are alternating currents that oscillate at high frequencies.
Essential Electronic Components and Their Functions
Several key electronic components appear on the Technician Exam. Here’s what they do:
- Resistors limit current flow.
- Capacitors store and release energy, often used in filtering circuits.
- Inductors store energy in magnetic fields and are important in tuning circuits.
- Diodes allow current to flow in only one direction, useful in rectifier circuits that convert AC to DC.
- Transistors act as switches and amplifiers in radio circuits.
Understanding these basics helps you answer questions about circuit behavior and troubleshooting.
Series and Parallel Circuits
Circuits are made up of components arranged in either series or parallel:
- In a series circuit, current flows through all components one after another. The same current passes through each, but the voltage is divided.
- In a parallel circuit, components share the same voltage, but the current divides among them.
For the exam, you should know how voltage, current, and resistance behave in each type of circuit. For example, total resistance in a series circuit is the sum of all resistances, while in parallel circuits, total resistance is lower than the smallest individual resistor.
Basic AC Concepts and Frequency
Radio waves are AC signals that oscillate at different frequencies. Frequency (f) is measured in hertz (Hz) and tells us how many times per second the wave changes direction. One kilohertz (kHz) is 1,000 Hz, and one megahertz (MHz) is 1,000,000 Hz.
Ham radios operate in different frequency bands, such as:
- VHF (Very High Frequency): 30 MHz – 300 MHz (e.g., 2-meter band)
- UHF (Ultra High Frequency): 300 MHz – 3 GHz (e.g., 70-centimeter band)
Higher frequencies allow for shorter antennas and are good for local communication, while lower frequencies travel further.
Modulation: How We Send Information Over Radio Waves
Modulation is how a radio wave (carrier wave) carries information. The Technician Exam covers three main types:
- Amplitude Modulation (AM): The signal strength (amplitude) changes with the voice signal.
- Frequency Modulation (FM): The frequency of the wave changes to encode information. FM is more resistant to noise and is commonly used in VHF and UHF bands.
- Single Sideband (SSB): A variation of AM that uses less bandwidth and is more efficient for long-distance communication.
Knowing these helps when selecting modes for different types of contacts.
Power, Batteries, and Safety
Most ham radios run on 12V DC power sources, such as batteries or regulated power supplies. It’s important to understand:
- Battery safety: Overcharging or short-circuiting batteries (especially lithium-ion) can be dangerous.
- Fuse protection: Many radios have built-in fuses to prevent excessive current draw.
Another key topic on the test is RF exposure safety. High-power transmissions can generate strong radio frequency (RF) radiation, which may cause health risks. To minimize exposure:
- Maintain a safe distance from transmitting antennas.
- Use the lowest power necessary for effective communication.
- Follow FCC RF exposure limits for your frequency and power level.
Ohm’s Law in Real-World Ham Radio Applications
A common exam question might involve calculating current or voltage using Ohm’s Law. For example:
Question: If a radio operates at 12V and draws 2A of current, what is the resistance?
Using Ohm’s Law:
Understanding these calculations can help with troubleshooting and designing circuits.
Final Thoughts: Studying for the Exam and Beyond
The Technician License Exam covers these topics, but learning electronics doesn’t stop there. Once licensed, you’ll continue exploring concepts like antenna design, signal propagation, and digital communication.
Great resources for studying include:
- ARRL’s Technician Class License Manual: The official guide with explanations and practice questions.
- HamStudy.org: Free practice tests and flashcards.
- QRZ.com Practice Exams: Simulated tests with real exam questions.
By mastering these basic electronics concepts, you’ll be well on your way to passing the exam and starting your journey in amateur radio. Keep practicing, get hands-on experience, and soon, you’ll be making contacts on the air!
D. Bryan King
Sources
- American Radio Relay League (ARRL) – Official Site
- FCC Amateur Radio Service – Licensing and Regulations
- QRZ.com – Amateur Radio Callsign Database
- HamStudy.org – Exam Prep and Study Tools
- Electronics Tutorials – Basic Circuit Theory
- RadioReference.com – Frequency Database and Scanner Information
- AMSAT – Amateur Radio Satellites and Space Communications
- DX Engineering – Ham Radio Equipment and Resources
- MikroE Learn – Electronics and Circuit Design Tutorials
- Radio Society of Great Britain (RSGB) – Ham Radio Resources
- Arduino – Microcontrollers and DIY Electronics for Ham Radio
- eHam.net – Amateur Radio News, Reviews, and Forums
Disclaimer:
The views and opinions expressed in this post are solely those of the author. The information provided is based on personal research, experience, and understanding of the subject matter at the time of writing. Readers should consult relevant experts or authorities for specific guidance related to their unique situations.
Related Posts
Rate this:
#ACVsDC #am #AmateurRadio #amateurRadioEducation #amateurRadioTraining #antennaTheory #ARRLStudyGuide #basicElectronics #beginnerHamRadio #capacitors #circuits #current #diodes #electricalComponents #electronicsBasics #examPrep #FCCExam #FM #hamExam #hamLicense #hamOperator #hamRadio #hamRadioBands #hamRadioBeginner #hamRadioComponents #hamRadioEquipment #hamRadioOperator #hamRadioStudy #HamRadioStudyGuide #HamRadioTraining #hamStudyGuide #inductors #modulation #OhmSLaw #powerSupply #radioBroadcasting #radioCommunication #radioFrequencies #radioFrequency #radioFundamentals #RadioLicensing #radioSignals #RadioTechnology #radioTransmission #radioWaves #resistance #resistors #RFExposure #RFSafety #SSB #technicianClass #TechnicianLicense #transistors #UHF #VHF #voltage
-
Basic Electronics for the Amateur Radio Operator: What You Need to Know for Your Technician License
1,003 words, 5 minutes read time.
If you’re preparing for the Amateur Radio Technician License Exam, understanding basic electronics is a must. While you don’t need to be an electrical engineer, the exam includes fundamental concepts like Ohm’s Law, circuits, components, and RF safety. This guide will walk you through the essential topics, ensuring you’re ready for the test and your first steps as a ham radio operator.
Understanding Electricity: The Basics for Amateur Radio
Electricity is the movement of electrons through a conductor, like a wire. Three key electrical properties define how electricity behaves:
- Voltage (V) is the force that pushes electrons through a circuit. It’s measured in volts (V).
- Current (I) is the flow of electrons, measured in amperes (A).
- Resistance (R) opposes the flow of electricity and is measured in ohms (Ω).
These three are tied together by Ohm’s Law, a fundamental equation in electronics:
V=I×R
This means if you know any two values, you can calculate the third. Understanding this equation is critical for both the exam and real-world troubleshooting.
Direct Current (DC) vs. Alternating Current (AC)
Electricity comes in two forms:
- Direct Current (DC) flows in one direction. Batteries and solar panels produce DC.
- Alternating Current (AC) changes direction many times per second. Household electricity is AC because it’s more efficient for transmission over long distances.
For amateur radio, most equipment runs on DC power, but you’ll also need to understand AC because radio signals are alternating currents that oscillate at high frequencies.
Essential Electronic Components and Their Functions
Several key electronic components appear on the Technician Exam. Here’s what they do:
- Resistors limit current flow.
- Capacitors store and release energy, often used in filtering circuits.
- Inductors store energy in magnetic fields and are important in tuning circuits.
- Diodes allow current to flow in only one direction, useful in rectifier circuits that convert AC to DC.
- Transistors act as switches and amplifiers in radio circuits.
Understanding these basics helps you answer questions about circuit behavior and troubleshooting.
Series and Parallel Circuits
Circuits are made up of components arranged in either series or parallel:
- In a series circuit, current flows through all components one after another. The same current passes through each, but the voltage is divided.
- In a parallel circuit, components share the same voltage, but the current divides among them.
For the exam, you should know how voltage, current, and resistance behave in each type of circuit. For example, total resistance in a series circuit is the sum of all resistances, while in parallel circuits, total resistance is lower than the smallest individual resistor.
Basic AC Concepts and Frequency
Radio waves are AC signals that oscillate at different frequencies. Frequency (f) is measured in hertz (Hz) and tells us how many times per second the wave changes direction. One kilohertz (kHz) is 1,000 Hz, and one megahertz (MHz) is 1,000,000 Hz.
Ham radios operate in different frequency bands, such as:
- VHF (Very High Frequency): 30 MHz – 300 MHz (e.g., 2-meter band)
- UHF (Ultra High Frequency): 300 MHz – 3 GHz (e.g., 70-centimeter band)
Higher frequencies allow for shorter antennas and are good for local communication, while lower frequencies travel further.
Modulation: How We Send Information Over Radio Waves
Modulation is how a radio wave (carrier wave) carries information. The Technician Exam covers three main types:
- Amplitude Modulation (AM): The signal strength (amplitude) changes with the voice signal.
- Frequency Modulation (FM): The frequency of the wave changes to encode information. FM is more resistant to noise and is commonly used in VHF and UHF bands.
- Single Sideband (SSB): A variation of AM that uses less bandwidth and is more efficient for long-distance communication.
Knowing these helps when selecting modes for different types of contacts.
Power, Batteries, and Safety
Most ham radios run on 12V DC power sources, such as batteries or regulated power supplies. It’s important to understand:
- Battery safety: Overcharging or short-circuiting batteries (especially lithium-ion) can be dangerous.
- Fuse protection: Many radios have built-in fuses to prevent excessive current draw.
Another key topic on the test is RF exposure safety. High-power transmissions can generate strong radio frequency (RF) radiation, which may cause health risks. To minimize exposure:
- Maintain a safe distance from transmitting antennas.
- Use the lowest power necessary for effective communication.
- Follow FCC RF exposure limits for your frequency and power level.
Ohm’s Law in Real-World Ham Radio Applications
A common exam question might involve calculating current or voltage using Ohm’s Law. For example:
Question: If a radio operates at 12V and draws 2A of current, what is the resistance?
Using Ohm’s Law:
Understanding these calculations can help with troubleshooting and designing circuits.
Final Thoughts: Studying for the Exam and Beyond
The Technician License Exam covers these topics, but learning electronics doesn’t stop there. Once licensed, you’ll continue exploring concepts like antenna design, signal propagation, and digital communication.
Great resources for studying include:
- ARRL’s Technician Class License Manual: The official guide with explanations and practice questions.
- HamStudy.org: Free practice tests and flashcards.
- QRZ.com Practice Exams: Simulated tests with real exam questions.
By mastering these basic electronics concepts, you’ll be well on your way to passing the exam and starting your journey in amateur radio. Keep practicing, get hands-on experience, and soon, you’ll be making contacts on the air!
D. Bryan King
Sources
- American Radio Relay League (ARRL) – Official Site
- FCC Amateur Radio Service – Licensing and Regulations
- QRZ.com – Amateur Radio Callsign Database
- HamStudy.org – Exam Prep and Study Tools
- Electronics Tutorials – Basic Circuit Theory
- RadioReference.com – Frequency Database and Scanner Information
- AMSAT – Amateur Radio Satellites and Space Communications
- DX Engineering – Ham Radio Equipment and Resources
- MikroE Learn – Electronics and Circuit Design Tutorials
- Radio Society of Great Britain (RSGB) – Ham Radio Resources
- Arduino – Microcontrollers and DIY Electronics for Ham Radio
- eHam.net – Amateur Radio News, Reviews, and Forums
Disclaimer:
The views and opinions expressed in this post are solely those of the author. The information provided is based on personal research, experience, and understanding of the subject matter at the time of writing. Readers should consult relevant experts or authorities for specific guidance related to their unique situations.
Related Posts
Rate this:
#ACVsDC #am #AmateurRadio #amateurRadioEducation #amateurRadioTraining #antennaTheory #ARRLStudyGuide #basicElectronics #beginnerHamRadio #capacitors #circuits #current #diodes #electricalComponents #electronicsBasics #examPrep #FCCExam #FM #hamExam #hamLicense #hamOperator #hamRadio #hamRadioBands #hamRadioBeginner #hamRadioComponents #hamRadioEquipment #hamRadioOperator #hamRadioStudy #HamRadioStudyGuide #HamRadioTraining #hamStudyGuide #inductors #modulation #OhmSLaw #powerSupply #radioBroadcasting #radioCommunication #radioFrequencies #radioFrequency #radioFundamentals #RadioLicensing #radioSignals #RadioTechnology #radioTransmission #radioWaves #resistance #resistors #RFExposure #RFSafety #SSB #technicianClass #TechnicianLicense #transistors #UHF #VHF #voltage
-
Basic Electronics for the Amateur Radio Operator: What You Need to Know for Your Technician License
1,003 words, 5 minutes read time.
If you’re preparing for the Amateur Radio Technician License Exam, understanding basic electronics is a must. While you don’t need to be an electrical engineer, the exam includes fundamental concepts like Ohm’s Law, circuits, components, and RF safety. This guide will walk you through the essential topics, ensuring you’re ready for the test and your first steps as a ham radio operator.
Understanding Electricity: The Basics for Amateur Radio
Electricity is the movement of electrons through a conductor, like a wire. Three key electrical properties define how electricity behaves:
- Voltage (V) is the force that pushes electrons through a circuit. It’s measured in volts (V).
- Current (I) is the flow of electrons, measured in amperes (A).
- Resistance (R) opposes the flow of electricity and is measured in ohms (Ω).
These three are tied together by Ohm’s Law, a fundamental equation in electronics:
V=I×R
This means if you know any two values, you can calculate the third. Understanding this equation is critical for both the exam and real-world troubleshooting.
Direct Current (DC) vs. Alternating Current (AC)
Electricity comes in two forms:
- Direct Current (DC) flows in one direction. Batteries and solar panels produce DC.
- Alternating Current (AC) changes direction many times per second. Household electricity is AC because it’s more efficient for transmission over long distances.
For amateur radio, most equipment runs on DC power, but you’ll also need to understand AC because radio signals are alternating currents that oscillate at high frequencies.
Essential Electronic Components and Their Functions
Several key electronic components appear on the Technician Exam. Here’s what they do:
- Resistors limit current flow.
- Capacitors store and release energy, often used in filtering circuits.
- Inductors store energy in magnetic fields and are important in tuning circuits.
- Diodes allow current to flow in only one direction, useful in rectifier circuits that convert AC to DC.
- Transistors act as switches and amplifiers in radio circuits.
Understanding these basics helps you answer questions about circuit behavior and troubleshooting.
Series and Parallel Circuits
Circuits are made up of components arranged in either series or parallel:
- In a series circuit, current flows through all components one after another. The same current passes through each, but the voltage is divided.
- In a parallel circuit, components share the same voltage, but the current divides among them.
For the exam, you should know how voltage, current, and resistance behave in each type of circuit. For example, total resistance in a series circuit is the sum of all resistances, while in parallel circuits, total resistance is lower than the smallest individual resistor.
Basic AC Concepts and Frequency
Radio waves are AC signals that oscillate at different frequencies. Frequency (f) is measured in hertz (Hz) and tells us how many times per second the wave changes direction. One kilohertz (kHz) is 1,000 Hz, and one megahertz (MHz) is 1,000,000 Hz.
Ham radios operate in different frequency bands, such as:
- VHF (Very High Frequency): 30 MHz – 300 MHz (e.g., 2-meter band)
- UHF (Ultra High Frequency): 300 MHz – 3 GHz (e.g., 70-centimeter band)
Higher frequencies allow for shorter antennas and are good for local communication, while lower frequencies travel further.
Modulation: How We Send Information Over Radio Waves
Modulation is how a radio wave (carrier wave) carries information. The Technician Exam covers three main types:
- Amplitude Modulation (AM): The signal strength (amplitude) changes with the voice signal.
- Frequency Modulation (FM): The frequency of the wave changes to encode information. FM is more resistant to noise and is commonly used in VHF and UHF bands.
- Single Sideband (SSB): A variation of AM that uses less bandwidth and is more efficient for long-distance communication.
Knowing these helps when selecting modes for different types of contacts.
Power, Batteries, and Safety
Most ham radios run on 12V DC power sources, such as batteries or regulated power supplies. It’s important to understand:
- Battery safety: Overcharging or short-circuiting batteries (especially lithium-ion) can be dangerous.
- Fuse protection: Many radios have built-in fuses to prevent excessive current draw.
Another key topic on the test is RF exposure safety. High-power transmissions can generate strong radio frequency (RF) radiation, which may cause health risks. To minimize exposure:
- Maintain a safe distance from transmitting antennas.
- Use the lowest power necessary for effective communication.
- Follow FCC RF exposure limits for your frequency and power level.
Ohm’s Law in Real-World Ham Radio Applications
A common exam question might involve calculating current or voltage using Ohm’s Law. For example:
Question: If a radio operates at 12V and draws 2A of current, what is the resistance?
Using Ohm’s Law:
Understanding these calculations can help with troubleshooting and designing circuits.
Final Thoughts: Studying for the Exam and Beyond
The Technician License Exam covers these topics, but learning electronics doesn’t stop there. Once licensed, you’ll continue exploring concepts like antenna design, signal propagation, and digital communication.
Great resources for studying include:
- ARRL’s Technician Class License Manual: The official guide with explanations and practice questions.
- HamStudy.org: Free practice tests and flashcards.
- QRZ.com Practice Exams: Simulated tests with real exam questions.
By mastering these basic electronics concepts, you’ll be well on your way to passing the exam and starting your journey in amateur radio. Keep practicing, get hands-on experience, and soon, you’ll be making contacts on the air!
D. Bryan King
Sources
- American Radio Relay League (ARRL) – Official Site
- FCC Amateur Radio Service – Licensing and Regulations
- QRZ.com – Amateur Radio Callsign Database
- HamStudy.org – Exam Prep and Study Tools
- Electronics Tutorials – Basic Circuit Theory
- RadioReference.com – Frequency Database and Scanner Information
- AMSAT – Amateur Radio Satellites and Space Communications
- DX Engineering – Ham Radio Equipment and Resources
- MikroE Learn – Electronics and Circuit Design Tutorials
- Radio Society of Great Britain (RSGB) – Ham Radio Resources
- Arduino – Microcontrollers and DIY Electronics for Ham Radio
- eHam.net – Amateur Radio News, Reviews, and Forums
Disclaimer:
The views and opinions expressed in this post are solely those of the author. The information provided is based on personal research, experience, and understanding of the subject matter at the time of writing. Readers should consult relevant experts or authorities for specific guidance related to their unique situations.
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#ACVsDC #am #AmateurRadio #amateurRadioEducation #amateurRadioTraining #antennaTheory #ARRLStudyGuide #basicElectronics #beginnerHamRadio #capacitors #circuits #current #diodes #electricalComponents #electronicsBasics #examPrep #FCCExam #FM #hamExam #hamLicense #hamOperator #hamRadio #hamRadioBands #hamRadioBeginner #hamRadioComponents #hamRadioEquipment #hamRadioOperator #hamRadioStudy #HamRadioStudyGuide #HamRadioTraining #hamStudyGuide #inductors #modulation #OhmSLaw #powerSupply #radioBroadcasting #radioCommunication #radioFrequencies #radioFrequency #radioFundamentals #RadioLicensing #radioSignals #RadioTechnology #radioTransmission #radioWaves #resistance #resistors #RFExposure #RFSafety #SSB #technicianClass #TechnicianLicense #transistors #UHF #VHF #voltage
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Something unexpected happened today.
The car radio suddenly turned on, and like any good horror movie setup, there was some very very VERY old music playing within the thick static (no channel was set).
So, I guess my question is, how long can a #radiowave last? Would it be able to survive some 70 years? Or is there another explanation? When trying to research, I was reading that someone suddenly heard an old commercial (50ies) once too.
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Discover how radio waves travel through different environments to power your favorite tech! 📡 From mobile networks to GPS, learn the science behind radio wave propagation and its impact on communication. #RadioWaves #WirelessCommunication #TechExplained
https://bdking71.wordpress.com/2025/02/12/radio-wave-propagation-how-signals-travel/
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Radio Waves: 35 Years of RNZ and Bulgarian National Radio’s New QSL cards
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for those who haven't seen it yet, there is a "Ham Challenge" going on this year, that is meant to:
"inspire you to extend your horizon in amateur radio by weekly challenges through the year that touch all aspects of ham radio (and related fields)."
#AmateurRadio #HamRadio #hamr #HamChallenge #radio @hamchallenge #puzzle #puzzles #skill #skills #science #ScienceMastodon #RadioWaves #weekly
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Radio Waves: RTI Receives Top-Rank, Vatican Radio interview, and the Complications Communicating with Voyager I
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🚀 #ICYMI
📻 Yesterday we launched the #OEGlobal24 "Conference of the Air" (via DS106 Radio)
OEGlobal's very first internet radio broadcast took place with @cogdog at the helm, and Taylor from Reclaim Hosting (who are supporting our radio station) and Maren Deepwell.
🔊 catch it here: https://www.youtube.com/watch?v=2cf8Bgd4aJE
#oldschool #radiowaves #educationradio #schooloftheair #openeducation #ANDConference
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🚀 #ICYMI
📻 Yesterday we launched the #OEGlobal24 "Conference of the Air" (via DS106 Radio)
OEGlobal's very first internet radio broadcast took place with @cogdog at the helm, and Taylor from Reclaim Hosting (who are supporting our radio station) and Maren Deepwell.
🔊 catch it here: https://www.youtube.com/watch?v=2cf8Bgd4aJE
#oldschool #radiowaves #educationradio #schooloftheair #openeducation #ANDConference
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🚀 Today
📻 Tune into the first broadcast of the #OEGlobal24 "Conference of the Air" as it Goes on the Air (via DS106 Radio)
OEGlobal's very first internet radio broadcast will take place with colleagues from Reclaim Hosting (who are supporting our radio station)
⏰ Tuesday, 29th Oct at 18:00 UTC
🔊 Listen (live): DS106 Radio https://bit.ly/ConfOfAir#oldschool #radiowaves #educationradio #schooloftheair #openeducation
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🚀 Tomorrow
📻 Tune into the first broadcast of the #OEGlobal24 "Conference of the Air" as it Goes on the Air (via DS106 Radio)
OEGlobal's very first internet radio broadcast will take place with colleagues from Reclaim Hosting (who are supporting our radio station)
⏰ Tuesday, 29th Oct at 18:00 UTC
🔊 Listen (live): DS106 Radio https://bit.ly/ConfOfAir#oldschool #radiowaves #educationradio #schooloftheair #openeducation
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Musk's #satellites 'blocking' view of the #universe
by Georgina Rannard
September 18, 2024"#RadioWaves from #ElonMusk’s growing network of satellites are blocking scientists’ ability to peer into the universe, according to researchers in the Netherlands.
"The new generation of Starlink satellites, which provide fast internet around the world, are interfering more with #RadioTelescopes than earlier versions, they say.
"The thousands of orbiting satellites are 'blinding' radio telescopes and may be hindering astronomical research, according to Netherlands Institute for Radio Astronomy (#ASTRON).
"#SpaceX, which owns Starlink, has not replied to a request from BBC News for comment.
"The satellites provide broadband internet around the world, often to remote places, including challenging environments like Ukraine and Yemen.
"They are also used to connect remote areas of the UK to fast internet. In 2022 tests showed that Starlink could deliver internet speeds four times faster than the average, according to the Department for Digital, Culture, Media and Sport.
"But astronomers say this comes at a cost.
"'Every time more of these are launched with these kinds of emission levels, we see less and less of the sky,' Professor Jessica Dempsey, director of ASTRON, told BBC News."
https://www.bbc.co.uk/news/articles/cy4dnr8zemgo
#DarkSkies #SpacePollution #SpaceJunk #SignalToNoise #TurnOffTheNoise #TooManySatellites #KesslerEffect #KesslerSyndrome
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Musk's #satellites 'blocking' view of the #universe
by Georgina Rannard
September 18, 2024"#RadioWaves from #ElonMusk’s growing network of satellites are blocking scientists’ ability to peer into the universe, according to researchers in the Netherlands.
"The new generation of Starlink satellites, which provide fast internet around the world, are interfering more with #RadioTelescopes than earlier versions, they say.
"The thousands of orbiting satellites are 'blinding' radio telescopes and may be hindering astronomical research, according to Netherlands Institute for Radio Astronomy (#ASTRON).
"#SpaceX, which owns Starlink, has not replied to a request from BBC News for comment.
"The satellites provide broadband internet around the world, often to remote places, including challenging environments like Ukraine and Yemen.
"They are also used to connect remote areas of the UK to fast internet. In 2022 tests showed that Starlink could deliver internet speeds four times faster than the average, according to the Department for Digital, Culture, Media and Sport.
"But astronomers say this comes at a cost.
"'Every time more of these are launched with these kinds of emission levels, we see less and less of the sky,' Professor Jessica Dempsey, director of ASTRON, told BBC News."
https://www.bbc.co.uk/news/articles/cy4dnr8zemgo
#DarkSkies #SpacePollution #SpaceJunk #SignalToNoise #TurnOffTheNoise #TooManySatellites #KesslerEffect #KesslerSyndrome
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Musk's #satellites 'blocking' view of the #universe
by Georgina Rannard
September 18, 2024"#RadioWaves from #ElonMusk’s growing network of satellites are blocking scientists’ ability to peer into the universe, according to researchers in the Netherlands.
"The new generation of Starlink satellites, which provide fast internet around the world, are interfering more with #RadioTelescopes than earlier versions, they say.
"The thousands of orbiting satellites are 'blinding' radio telescopes and may be hindering astronomical research, according to Netherlands Institute for Radio Astronomy (#ASTRON).
"#SpaceX, which owns Starlink, has not replied to a request from BBC News for comment.
"The satellites provide broadband internet around the world, often to remote places, including challenging environments like Ukraine and Yemen.
"They are also used to connect remote areas of the UK to fast internet. In 2022 tests showed that Starlink could deliver internet speeds four times faster than the average, according to the Department for Digital, Culture, Media and Sport.
"But astronomers say this comes at a cost.
"'Every time more of these are launched with these kinds of emission levels, we see less and less of the sky,' Professor Jessica Dempsey, director of ASTRON, told BBC News."
https://www.bbc.co.uk/news/articles/cy4dnr8zemgo
#DarkSkies #SpacePollution #SpaceJunk #SignalToNoise #TurnOffTheNoise #TooManySatellites #KesslerEffect #KesslerSyndrome
-
Musk's #satellites 'blocking' view of the #universe
by Georgina Rannard
September 18, 2024"#RadioWaves from #ElonMusk’s growing network of satellites are blocking scientists’ ability to peer into the universe, according to researchers in the Netherlands.
"The new generation of Starlink satellites, which provide fast internet around the world, are interfering more with #RadioTelescopes than earlier versions, they say.
"The thousands of orbiting satellites are 'blinding' radio telescopes and may be hindering astronomical research, according to Netherlands Institute for Radio Astronomy (#ASTRON).
"#SpaceX, which owns Starlink, has not replied to a request from BBC News for comment.
"The satellites provide broadband internet around the world, often to remote places, including challenging environments like Ukraine and Yemen.
"They are also used to connect remote areas of the UK to fast internet. In 2022 tests showed that Starlink could deliver internet speeds four times faster than the average, according to the Department for Digital, Culture, Media and Sport.
"But astronomers say this comes at a cost.
"'Every time more of these are launched with these kinds of emission levels, we see less and less of the sky,' Professor Jessica Dempsey, director of ASTRON, told BBC News."
https://www.bbc.co.uk/news/articles/cy4dnr8zemgo
#DarkSkies #SpacePollution #SpaceJunk #SignalToNoise #TurnOffTheNoise #TooManySatellites #KesslerEffect #KesslerSyndrome
-
Musk's #satellites 'blocking' view of the #universe
by Georgina Rannard
September 18, 2024"#RadioWaves from #ElonMusk’s growing network of satellites are blocking scientists’ ability to peer into the universe, according to researchers in the Netherlands.
"The new generation of Starlink satellites, which provide fast internet around the world, are interfering more with #RadioTelescopes than earlier versions, they say.
"The thousands of orbiting satellites are 'blinding' radio telescopes and may be hindering astronomical research, according to Netherlands Institute for Radio Astronomy (#ASTRON).
"#SpaceX, which owns Starlink, has not replied to a request from BBC News for comment.
"The satellites provide broadband internet around the world, often to remote places, including challenging environments like Ukraine and Yemen.
"They are also used to connect remote areas of the UK to fast internet. In 2022 tests showed that Starlink could deliver internet speeds four times faster than the average, according to the Department for Digital, Culture, Media and Sport.
"But astronomers say this comes at a cost.
"'Every time more of these are launched with these kinds of emission levels, we see less and less of the sky,' Professor Jessica Dempsey, director of ASTRON, told BBC News."
https://www.bbc.co.uk/news/articles/cy4dnr8zemgo
#DarkSkies #SpacePollution #SpaceJunk #SignalToNoise #TurnOffTheNoise #TooManySatellites #KesslerEffect #KesslerSyndrome
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Sui blockchain taps radio waves to bank the offline unbanked - Sui blockchain innovates with alternative methods, like radio waves, to ... - https://cointelegraph.com/news/sui-blockchain-offline-crypto-transactions-radio-waves #offlinecryptotransactions #internet-lesstransactions #decentralizedpayments #financialinclusion #suiblockchain #radiowaves #unbanked #depin
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Radio Waves: SV3ORA’s Channel, European Shortwave Advantages, Early Radio Astronomy, Pi-Pico SDR, and Charged for Exporting Radio Gear to Russian
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Radio Waves: Radio Apocalypse, SDRs, and Updated StarWaves DRM App
https://swling.com/blog/2024/08/radio-waves-radio-apocalypse-sdrs-and-updated-starwaves-drm-app/
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Radio Waves: Sonic Bonds, FCC Hits FM Pirate Landlords, Brokered Programming at WBCQ, WCPO, Tecsun AN-48X Loop, and “Is Shortwave on Life Support?”
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Radio Waves: Who Will Pay, Ham Radio Culture, OTH Support, Night of Nights, and 100 Years of Radio
#Broadcasting #HamRadio #KPH #OTHRADAR #PointReyes #RadioHistory #RadioWaves
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Radio Waves: Baofeng HTs Used by Militants, Ham Radio Memory, and Radio Sunshine
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Radio Waves: HEBA Antenna Approval, Eclipse Time Signal Shift, A Novice’s Guide to Amateur Radio Astronomy, and Voyager 1 Sending Data Again!!
#2024SolarEclipse #EclipsePropagation #HEBAAntenna #RadioAstronomy #RadioWaves #VoyagerI
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Radio Waves: International Symposium Focuses on Broadcasting, Last Morse Station, Yaesu FRG-7 Digital Frequency Kit, and Remembering Bob Heil,
#BobHeil #KPH #PointReyes #RadioWaves #UniversitToulouse #YaesuFRG7
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Radio Waves: What Listeners Like, Renaissance of Radio, WOR in Photographs, DIY Faraday Cage
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Radio Waves: RTI Test Broadcast Today, Messages to North Korea, Exploring Space Weather Book, Vintage Radios at Auction, and WMLK
#NorthKorea #RadioTaiwanInternational #RadioWaves #SchulmanAuction #SpaceWeather #WMLK
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#RadioWaves were first #predicted by the #theory of electromagnetism proposed in 📆 1867 by #Scottish 🏴 mathematical physicist James Clerk Maxwell. In 📆 1887, German 🇩🇪 physicist Heinrich Hertz demonstrated the reality of Maxwell's electromagnetic waves by #experimentally generating #radio waves in his #laboratory 👨🔬 https://en.wikipedia.org/wiki/Radio_wave#Discovery_and_exploitation
Picture : https://commons.wikimedia.org/wiki/File:Wireless_tower.svg
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#BBC #UFOs : #Nasa's #UAP team mentioned a burst of #RadioWaves picked up by researchers in #Australia 🇦🇺.
"They had really strange structure. People couldn't figure out what was going on. Then they start to notice a lot of them bunched together around #lunch 🍽️ time"
It turned out that the sensitive instruments used by researchers were picking up #signals 📶 from a #microwave used to heat up their lunches. https://www.bbc.com/news/world-us-canada-65729356
Pictures (combined) : #Avrocar on the #moon with human on board
https://commons.wikimedia.org/wiki/File:NASA_2015_(Unsplash).jpg
https://commons.wikimedia.org/wiki/File:Avrocar_flying.jpg
https://commons.wikimedia.org/wiki/File:Anencephaly_front.jpg -
Radio Waves: State of AM Radio, Quindar Tones Hack, AI DJs, BBC Pop-Up Station for Sudan, Artemis II & Ham Radio, and a Morse Revival
#AIDJs #AMRadio #ArtemisII #BBC #CW #MorseCode #Quindar #QuindarTones #RadioWaves #ShortwaveRadio #Sudan
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📻 If you are interested in #DigitalRadioMondiale, I'm very much looking forward to read from you!
🔗 https://en.wikipedia.org/wiki/Digital_Radio_Mondiale
🌺
🏷️ #Longwave #Mediumwave #Shortwave #HamRadio #Introduction #Radio #RadioWaves #CitizenBand #Broadcast #Rundfunk #Langwelle #Mittelwelle #Kurzwelle #ETSI #Eurovision #EBU #CiBi #CBFunk #27MHz #11Meter #27mc #BroadcastClock #AmateurRadio
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📻 If you are interested in #DigitalRadioMondiale, I'm very much looking forward to read from you!
🔗 https://en.wikipedia.org/wiki/Digital_Radio_Mondiale
🌺
🏷️ #Longwave #Mediumwave #Shortwave #HamRadio #Introduction #Radio #RadioWaves #CitizenBand #Broadcast #Rundfunk #Langwelle #Mittelwelle #Kurzwelle #ETSI #Eurovision #EBU #CiBi #CBFunk #27MHz #11Meter #27mc #BroadcastClock #AmateurRadio
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📻 If you are interested in #DigitalRadioMondiale, I'm very much looking forward to read from you!
🔗 https://en.wikipedia.org/wiki/Digital_Radio_Mondiale
🌺
🏷️ #Longwave #Mediumwave #Shortwave #HamRadio #Introduction #Radio #RadioWaves #CitizenBand #Broadcast #Rundfunk #Langwelle #Mittelwelle #Kurzwelle #ETSI #Eurovision #EBU #CiBi #CBFunk #27MHz #11Meter #27mc #BroadcastClock #AmateurRadio
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📻 If you are interested in #DigitalRadioMondiale, I'm very much looking forward to read from you!
🔗 https://en.wikipedia.org/wiki/Digital_Radio_Mondiale
🌺
🏷️ #Longwave #Mediumwave #Shortwave #HamRadio #Introduction #Radio #RadioWaves #CitizenBand #Broadcast #Rundfunk #Langwelle #Mittelwelle #Kurzwelle #ETSI #Eurovision #EBU #CiBi #CBFunk #27MHz #11Meter #27mc #BroadcastClock #AmateurRadio
